> Magento2中文手册 > 503(Backend Fetch Failed)解决方法

503(Backend Fetch Failed后端获取失败)

如果Magento2缓存标签使用长度超过8192个字符,你可以看到HTTP 503(后台读取失败)在浏览器中的错误。这些错误可能显示如下:

Error 503 Backend fetch failed
Backend fetch failed

为了解决这个问题,修改varnish配置文件如下:

  1. root 用户打开:

    • CentOS 6: /etc/sysconfig/varnish
    • CentOS 7: /etc/varnish/varnish.params
    • Ubuntu: /etc/default/varnish
  2. 搜索 http_resp_hdr_len 参数.
  3. 如果参数不存在增加 thread_pool_max.
  4. 设置 http_resp_hdr_len

    示例:

    -p http_resp_hdr_len=64000 \
    

    代码片段:

    # DAEMON_OPTS is used by the init script.
    DAEMON_OPTS="-a ${VARNISH_LISTEN_ADDRESS}:${VARNISH_LISTEN_PORT} \
         -f ${VARNISH_VCL_CONF} \
         -T ${VARNISH_ADMIN_LISTEN_ADDRESS}:${VARNISH_ADMIN_LISTEN_PORT} \
         -p thread_pool_min=${VARNISH_MIN_THREADS} \
         -p thread_pool_max=${VARNISH_MAX_THREADS} \
         -p http_resp_hdr_len=64000 \
         -S ${VARNISH_SECRET_FILE} \
         -s ${VARNISH_STORAGE}"